Figure 2. (a) Principal component analysis (PCA) of onlyM. americana samples; (b) All examined New World Martessamples, identifying 2 intermediate hybrids; and (c) PCA of M.
caurina samples only, demonstrating significant differentiation between
insular and continental populations (39% of variation, PC1), and also
between distinct continental populations of M. caurina (34% of
variation, PC2). (d) mirrored mitochondrial genome (mitogenome, left)
and autosomal SNP (right) phylogenies, depicting 2 monophyletic marten
species (M. americana green, M. caurina blue) and 2
unsorted, putative hybrids (MTX, KUI). Sample abbreviations are defined
in Table 1.